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When installing a machine which is to be a VM host, it is necessary to
make arrangements for the networking for the VMs. By default at the
moment this is done by having libvirt create a "virbr0" bridge. The
physical network interface is not enslaved to this bridge. Instead, all
of the VM's traffic is routed, and natted, through the host.
This is appropriate for a laptop and perhaps for some desktops. It's
definitely not appropriate for servers. For servers, the physical
interface should be enslaved to the bridge; the networking parameters in
/etc/network/interfaces should be applied to the bridge, and VMs should
speak directly (ie, bridged) to the local LAN. (By default.) Ideally
this should be done by having the bridge be set up by ifup ie configured
in /etc/network/interfaces.
Apologies for not knowing exactly the right package for this bug report.
** Affects: libvirt (Ubuntu)
Importance: Medium
Status: Incomplete
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virtual machines should not have nat on servers
https://bugs.launchpad.net/bugs/865515
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Team, which is subscribed to libvirt in Ubuntu.
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